High-performance multi-stage axial-flow type air compression system and using method

Abstract

The invention discloses a high-performance multi-stage axial-flow type air compression system and a using method, and the system comprises a compressor body, one end of which is connected with a motor through a gear box, and which comprises a compressor inlet and a compressor outlet; the single-row inlet adjustable guide vane is arranged in the compressor body; the air inlet pipeline is connected to an air inlet chamber of the compressor body; the interstage deflation pipeline is connected to the interstage deflation chamber of the compressor body and is provided with an interstage deflation valve; the exhaust emptying pipeline is connected to an outlet of the compressor body and is provided with an exhaust emptying valve; the exhaust air supply pipeline is connected to an outlet of the compressor body and is provided with an exhaust air supply valve; the efficiency and the pressure ratio of the air compression system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air compression systems, and in particular to a high-performance multi-stage axial flow air compression system and a use method thereof. Background Art

[0002] Air compression technology is a key technology widely used in various industrial production fields. It uses a compressor to increase the pressure of air to the required level to meet the needs of various process flows. In modern industry, the application range of air compressors is extremely wide, covering almost all industrial fields, such as energy storage, petroleum, chemical industry, electricity, metallurgy, mining, etc. Among them, axial flow compression systems are widely used due to their high efficiency and large flow. However, with the increasing demand for high-pressure air in industrial production, how to improve the efficiency and pressure ratio of air compression systems has become a problem that needs to be solved in the current field of air compression technology.

[0003] According to GB / T 4976-2017 "Classification of Compressors", compressors can be divided into positive displacement compressors and dynamic compressors based on their working principle and structure.

[0004] Positive displacement compressors increase gas pressure by changing the size of the working chamber volume. Common types include reciprocating compressors and screw compressors. Taking screw compressors as an example, the typical efficiency is only between 65% and 75%, the single-stage pressure ratio is generally between 5 and 10, and usually not multiple stages are used. It is suitable for small and medium flow requirements, and the typical processing capacity is only 100 to 10,000 cubic meters per hour. In addition, the screw compressor has weak regulation ability, which is mainly regulated by speed control, and the efficiency will drop at non-optimal points. There are also differences in the air delivery quality of positive displacement compressors. For example, the air flow pulsation of reciprocating compressors is larger, while the air flow pulsation of screw compressors is relatively small.

[0005] Dynamic compressors increase the pressure of gas by increasing the speed of gas movement and converting its kinetic energy into pressure energy. Common dynamic / turbine compressors include centrifugal compressors and axial compressors. Centrifugal compressors are more adaptable and can achieve very high exhaust pressures and a wider range of volume flow rates, but the allowable flow rate and efficiency are lower than those of axial compressors. The typical efficiency of centrifugal compressors is between 75% and 85%, the single-stage pressure ratio is generally 3 to 6, and multi-stage compression can reach 10 to 20 (inter-stage cooling). It is suitable for medium flow requirements and has a typical processing capacity of 1,000 to 100,000 cubic meters / hour. Dynamic compressors have a higher air delivery quality, and the airflow is continuous and stable.

[0006] For centrifugal compressors, multi-stage compression is often used to increase the system pressure ratio:

[0007] (1) Multiple stages in series. By connecting multiple centrifugal compressor stages in series, each stage gradually increases the gas pressure, thereby achieving a higher total pressure ratio. The pressure ratio of each stage is relatively small, but by accumulating multiple stages, a higher total pressure ratio can be achieved.

[0008] (2) Intercooling: An intercooler is introduced during the multi-stage compression process to cool the gas to reduce the temperature, thereby reducing the gas volume and improving the efficiency and compression ratio of the next stage of compression.

[0009] But the disadvantages of multi-level compression are also obvious:

[0010] (1) Complex structure. The structural design of a multi-stage centrifugal compressor is relatively complex, involving multiple impellers, diffusers, and interstage coolers. This increases the complexity of design, manufacturing, and maintenance.

[0011] (2) Increased volume and weight. Increasing the number of compression stages will increase the overall length and weight of the equipment, especially in applications that need to handle high pressure ratios. This is particularly disadvantageous for application scenarios with space and weight constraints.

[0012] (3) Efficiency loss. Each stage of compression will have a certain efficiency loss, and the thermal and mechanical losses between stages will accumulate, resulting in the overall efficiency of the multi-stage compressor being lower than that of the single-stage compressor. Although the multi-stage design can increase the pressure ratio, the overall efficiency may not be comparable to the optimized single-stage design, and the total efficiency may be reduced by 10% to 20%, to only 65% ​​to 75%.

[0013] (4) Complex operation. Multi-stage compressors require more complex operation and control systems to ensure coordination and optimal operation between each stage. This includes speed control, interstage cooling and flow control, which increases the complexity of operation and the requirements for operator skills.

[0014] (5) Increased cooling demand. During the multi-stage compression process, the gas temperature will increase step by step, and an interstage cooler needs to be introduced to reduce the gas temperature to improve the compression efficiency of the next stage. This not only increases the complexity of the system, but also requires additional cooling equipment and cooling media, which increases the operating cost of the system. Summary of the invention

[0015] In order to solve the above technical problems, the present invention provides a high-performance multi-stage axial flow air compression system to solve the above problems.

[0016] The present invention adopts the following technical solutions:

[0017] A high-performance multi-stage axial flow air compression system, comprising:

[0018] A compressor body, one end of which is connected to the motor through a gear box, including a compressor inlet and a compressor outlet;

[0019] Single-row inlet adjustable guide vanes, set inside the compressor body;

[0020] An air intake pipeline connected to an air intake chamber of the compressor body;

[0021] An interstage bleed pipe is connected to the interstage bleed chamber of the compressor body and has an interstage bleed valve;

[0022] An exhaust vent pipeline, connected to the outlet of the compressor body, having an exhaust vent valve;

[0023] The exhaust air supply pipeline is connected to the outlet of the compressor body and is provided with an exhaust air supply valve.

[0024] Preferably, the interstage bleed pipeline includes a low-pressure interstage bleed pipeline, a medium-pressure interstage bleed pipeline and a high-pressure interstage bleed pipeline, the low-pressure interstage bleed pipeline is provided with a low-pressure interstage bleed valve, the medium-pressure interstage bleed pipeline is provided with a medium-pressure interstage bleed valve, and the high-pressure interstage bleed pipeline is provided with a high-pressure interstage bleed valve.

[0025] Preferably, the chamber where the compressor balancing disk of the compressor body is located is further provided with a balancing chamber air bleed pipeline, and the balancing chamber air bleed regulating valve is provided on the balancing chamber air bleed pipeline.

[0026] Preferably, the exhaust vent pipeline includes a first exhaust vent pipeline and a second exhaust vent pipeline, the first exhaust vent pipeline is provided with an exhaust vent coarse adjustment valve, and the second exhaust vent pipeline is provided with an exhaust vent fine adjustment valve.

[0027] Preferably, the exhaust air supply pipeline has an exhaust check valve and an exhaust air supply valve.

[0028] Preferably, a filter and a muffler are provided on the air intake pipeline.

[0029] A method for using a high-performance multi-stage axial flow air compression system, applicable to the high-performance multi-stage axial flow air compression system, including a startup process, a continuous operation process, and a shutdown process;

[0030] The startup process includes:

[0031] Atmosphere enters the compressor body through the air intake pipeline. After being compressed by the compressor body, part of the fluid is discharged through the interstage bleed pipeline, and the rest of the fluid is discharged through the exhaust bleed pipeline at the compressor outlet. Before the unit speeds up to the rated speed, the interstage bleed pipeline is closed;

[0032] After the inter-stage vent pipeline is closed and the unit speed is increased to the rated speed, the exhaust gas is gradually transferred from the exhaust vent pipeline to the exhaust air supply pipeline by adjusting the exhaust vent valve and the exhaust air supply valve in a linked manner to provide the required high-pressure gas for the downstream process equipment.

[0033] Preferably, the continuous operation process includes: after the exhaust vent pipeline is closed, the unit reaches a continuous operation state, the atmosphere enters the compressor body through the air intake pipeline, and after being compressed by the compressor, it is passed to the downstream process through the exhaust air supply pipeline; before the unit is slowed down and shut down, the exhaust vent valve and the exhaust air supply valve are adjusted in a linked manner to gradually transfer the exhaust from the exhaust air supply pipeline to the exhaust vent pipeline, thereby cutting off the unit from the downstream process flow.

[0034] Preferably, the shutdown process includes: opening the interstage bleed pipe and starting the speed reduction shutdown; during the shutdown process, the atmosphere enters the compressor body through the air intake pipe, and after being compressed by the compressor body, part of the fluid is discharged through the interstage bleed pipe between the stages of the compressor body, and the remaining fluid is discharged through the exhaust bleed pipe at the compressor outlet.

[0035] Compared with the prior art, the present invention has the following advantages:

[0036] 1. High efficiency and energy saving: The axial flow air compression system of the present invention has the characteristics of high pressure ratio and high efficiency. First, the compressor body ensures the safe start and stop of the unit through interstage bleed, and only retains the adjustable guide vane at the inlet level, which minimizes the decrease in efficiency and surge margin caused by the clearance at the end of the adjustable guide vane. Secondly, under the design working conditions, the variable efficiency of the axial flow compressor unit is not less than 86%, the pressure ratio is not less than 16, and the exhaust temperature is not less than 400℃, thereby achieving high efficiency and energy saving.

[0037] 2. Safe and reliable: The axial flow air compression system of the present invention is equipped with an interstage bleed pipe, an exhaust vent pipe and an exhaust air supply pipe, as well as corresponding valves, which can effectively prevent the unit from surging during the start-up and shutdown process and the continuous operation process. The surge margin is not less than 20%, ensuring the safe operation of the unit. During the start-up and shutdown process, the interstage bleed and the inlet adjustable guide vane linkage control can ensure that the unit does not experience flow instability, stall or surge during operation. During the continuous operation at the rated speed, the adjustability of the exhaust bleed and exhaust air supply can ensure that the working state of the unit will not deviate too much from the design state.

[0038] 3. Flexible adjustment: The axial flow air compression system of the present invention can adjust the exhaust flow rate through the inlet adjustable guide vanes and the interstage air release valve. The adjustable flow rate at the rated speed reaches 75% to 105% of the design flow rate. The exhaust pressure is adjusted by the exhaust venting and exhaust air supply valve, and the adjustment is sensitive and the response is fast. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a high-performance multi-stage axial flow air compression system.

[0040] In the figure, an intake pipeline 1, an electric motor 2, a gear box 3, a compressor body 4, a compressor inlet 4-1, a compressor outlet 4-2, an inlet adjustable guide vane 5, a low-pressure interstage air bleed valve 6, a medium-pressure interstage air bleed valve 7, a high-pressure interstage air bleed valve 8, a balancing chamber air bleed regulating valve 9, an exhaust vent coarse adjustment valve 10, an exhaust vent fine adjustment valve 11, an exhaust check valve 12, an exhaust air supply valve 13, an interstage air bleed chamber 14, compressor stator blades 15, compressor moving blades 16, and a compressor balancing disk 17. DETAILED DESCRIPTION

[0041] In order to facilitate the understanding of the technical solution of the present invention, a detailed description is given below in conjunction with the accompanying drawings and specific embodiments.

[0042] like Figure 1 As shown, a high-performance multi-stage axial flow air compression system includes an air intake pipeline 1, a compressor body 4, an inlet adjustable guide vane 5, an inter-stage bleed pipeline, an exhaust vent pipeline and an exhaust air supply pipeline.

[0043] One end of the compressor body 4 is connected to the motor 2 through the gear box 3, including a compressor inlet 4-1 and a compressor outlet 4-2; the compressor body 4 uses a multi-stage axial flow compressor, and through a multi-stage compression process, it realizes high-pressure ratio air compression to meet the process flow's demand for high-pressure air; at the same time, the axial flow multi-stage compression can ensure the efficiency of the compression system and reduce equipment cost, operation cost and maintenance cost.

[0044] The inlet adjustable guide vane 5 is a single-row structure, and is disposed inside the compressor body 4; at the rated speed, the flow rate regulation in the range of 75% to 105% can be achieved by rotating the inlet adjustable guide vane 5;

[0045] The air intake pipeline 1 is connected to the air intake chamber of the compressor body 4 and is used to introduce the atmosphere into the compressor body 4;

[0046] The interstage bleed pipe is connected to the interstage bleed chamber 14 of the compressor body 4 and has an interstage bleed valve;

[0047] The exhaust vent pipeline is connected to the compressor outlet 4-2 of the compressor body 4 and has an exhaust vent valve, which can cut off the connection with the downstream process pipeline during the start and stop process of the compressor body 4, so that the compressor body 4 can be started and stopped independently to ensure the safety of the unit; at the same time, it can also be used as a reserved means to control the working state of the unit during the operation of the unit to prevent the unit from gasping;

[0048] The exhaust air supply pipeline is connected to the compressor outlet 4-2 of the compressor body 4 and has an exhaust air supply valve to ensure the stable delivery of high-pressure air;

[0049] The balance chamber venting pipeline is connected to the chamber where the compressor balancing disk 17 of the compressor body 4 is located, and a balance chamber venting regulating valve 9 is provided on the balance chamber venting pipeline;

[0050] The present invention is provided with an inter-stage bleed pipeline, a balance chamber bleed pipeline, an exhaust vent pipeline and an exhaust air supply pipeline. The design of these pipelines can effectively adjust the working state of the compressor body 4, prevent the compressor body 4 from surging or axial force reversal during start-up, shutdown and operation, and improve the operating stability of the compressor body 4.

[0051] In the design of the compressor unit, the present invention adopts a high-efficiency and large-margin design, so that under the design conditions, the variable efficiency of the compressor unit is not less than 86%, the pressure ratio is not less than 16, the exhaust temperature is not lower than 400°C, and the surge margin is not less than 20%, thereby achieving high-pressure ratio, high-efficiency, large-margin, and large-flow air compression.

[0052] As an implementation mode, the interstage bleed pipeline includes a low-pressure interstage bleed pipeline, a medium-pressure interstage bleed pipeline and a high-pressure interstage bleed pipeline, and the low-pressure interstage bleed pipeline, the medium-pressure interstage bleed pipeline and the high-pressure interstage bleed pipeline are respectively connected to the corresponding interstage bleed chamber 14; a low-pressure interstage bleed valve 6 is provided on the low-pressure interstage bleed pipeline, a medium-pressure interstage bleed valve 7 is provided on the medium-pressure interstage bleed pipeline, and a high-pressure interstage bleed valve 8 is provided on the high-pressure interstage bleed pipeline, which can adjust the interstage matching of the compressor body 4 during the start and stop process of the compressor body 4 to avoid unit stall or surge and ensure the safety of the unit.

[0053] As an implementation method, the exhaust vent pipeline includes an exhaust vent first pipeline and an exhaust vent second pipeline. The exhaust vent first pipeline is provided with an exhaust vent coarse adjustment valve 10, and the exhaust vent second pipeline is provided with an exhaust vent fine adjustment valve 11. During the start and stop process of the compressor, the connection with the downstream process pipeline can be cut off, so that the compressor unit can be started and stopped independently to ensure the safety of the unit. At the same time, it can also be used as a reserved means to control the working state of the unit during the operation of the unit to prevent the unit from gasping.

[0054] As an implementation method, the exhaust air supply pipeline has an exhaust check valve 12 and an exhaust air supply valve 13. The exhaust air supply valve 13 is a regulating valve that can ensure the stable delivery of high-pressure air. At the same time, the exhaust check valve 12 can prevent the reverse flow of high-pressure air, thereby improving the operating safety of the compressor unit.

[0055] As an implementation method, the air intake pipeline 1 is provided with a filter, a muffler and other equipment for filtering the outside air and sending it into the compressor unit, thereby ensuring that the air entering the compressor unit is clean, avoiding damage to the compressor unit by impurities, and improving the operating reliability of the compressor unit.

[0056] The present invention avoids adopting a solution of multiple rows or even all adjustable stator blades, and multiple inter-stage bleed pipes and corresponding bleed valves are arranged between the stages of the compressor body 4, which are combined with the exhaust venting coarse adjustment, fine adjustment valve and inlet adjustable guide vane to avoid stalling or surging of the unit during start-up and shutdown.

[0057] The axial flow compression system involved in the present invention requires the flow and pressure regulation during the startup process to be combined with the linkage control of the interstage venting pipeline, the inlet adjustable guide vane and the exhaust venting (coarse adjustment and fine adjustment) pipeline, and about 4 to 6 actuators (valves or servo actuators) need to be adjusted online. Although the number may be more than the technical solution of full stationary blade adjustment (single servo actuator controlling the adjustable guide vane), the controlled valves are all on the peripheral pipeline (the servo actuator of the adjustable guide vane is generally installed near the body to shorten the connecting rod length), and safety and stability are easy to ensure.

[0058] The axial flow compression system involved in the present invention increases the compression ratio of the compressor to more than 16 and the exhaust temperature to 400° C. without using interstage cooling, while ensuring high efficiency and high stability of the flow.

[0059] A method for using a high-performance multi-stage axial flow air compression system, applicable to the high-performance multi-stage axial flow air compression system, including a startup process, a continuous operation process, and a shutdown process;

[0060] The startup process includes:

[0061] Atmosphere enters the compressor body 4 through the air intake pipe 1. After being compressed by the compressor body 4, part of the fluid is discharged through the interstage vent pipe, and the rest of the fluid is discharged through the exhaust vent pipe at the compressor outlet 4-2. Before the unit speeds up to the rated speed, the interstage vent pipe is closed;

[0062] After the inter-stage vent pipeline is closed and the unit speed is increased to the rated speed, the exhaust gas is gradually transferred from the exhaust vent pipeline to the exhaust air supply pipeline by adjusting the exhaust vent valve and the exhaust air supply valve in a linked manner to provide the required high-pressure gas for the downstream process equipment.

[0063] The continuous operation process includes:

[0064] After the exhaust vent pipeline is closed, the unit reaches a continuous operation state, and the atmosphere enters the compressor body 4 through the air intake pipeline 1. After being compressed by the compressor, it is passed to the downstream process through the exhaust air supply pipeline; before the unit is slowed down and shut down, the exhaust vent valve and the exhaust air supply valve are adjusted in conjunction to gradually transfer the exhaust from the exhaust air supply pipeline to the exhaust vent pipeline, thereby cutting off the unit from the downstream process flow.

[0065] The shutdown process includes: opening the inter-stage bleed pipe and starting the speed reduction shutdown; during the shutdown process, the atmosphere enters the compressor body 4 through the intake pipe 1, and after being compressed by the compressor body 4, part of the fluid is discharged through the inter-stage bleed pipe between the stages of the compressor body 4, and the remaining fluid is discharged through the exhaust bleed pipe at the compressor outlet 4-2.

[0066] Example 1

[0067] The design point design targets of Example 1 are shown in Table 1.

[0068] Table 1 Axial flow compressor performance parameters

[0069] Design point flow 60~65kg / s Design speed 8500~9000RPM Design point pressure ratio ≮16 Design point efficiency ≮86％ Design speed surge margin ≮20％ Power consumption 28~33MW

[0070] The specific implementation steps of the high-performance multi-stage axial flow air compression system of this embodiment are as follows:

[0071] (1) Step 1: Select a multi-stage axial flow compressor body, the rated power of the compressor is about 30MW, the speed is 8600RPM, the variable efficiency under the design condition is 86%, the pressure ratio is 16, the exhaust temperature is 400℃, and the surge margin is 20%.

[0072] The compressor body is provided with a row of inlet adjustable guide vanes and corresponding connecting rod mechanisms and servo actuators.

[0073] (2) Step 2: Arrange a two-stage filter on the air intake pipe 1 of the compressor body 4 to filter the outside air and send it to the compressor unit. Arrange a muffler on the air intake pipe 1 of the compressor body 4 to ensure that the maximum sound pressure level at a distance of 1 meter from the equipment is no more than 85dB. If needed, a filter with a backflush function can be selected to ensure the filtering accuracy, or a precooler / preheater can be arranged on the air intake pipe 1 to control the air intake temperature of the compressor unit.

[0074] (3) Step 3: The compressor body 4 is provided with an interstage bleed pipe and a balance chamber bleed pipe, which are connected to the chimney or vent pipe of the plant. The interstage bleed pipe draws high-pressure gas from the interstage of the unit body, and an interstage bleed valve is arranged on the pipeline, which is a regulating valve or a switch valve. The number of pipelines is usually two or three, and the total pipe diameter is DN150 to DN250. The air inlet is located at different axial positions between the compressor stages to adjust the interstage matching of the compressor during the start-stop process.

[0075] The balance chamber bleed pipe draws gas from the low-pressure chamber of the unit's balance disk. The pipe diameter ranges from DN125 to DN200. A balance chamber bleed valve, which is a regulating valve, is arranged on the pipeline.

[0076] (4) Step 4: The compressor outlet 4-2 of the compressor body 4 is provided with an exhaust vent pipeline and an exhaust air supply pipeline. The exhaust vent pipeline is located at the compressor outlet 4-2 of the compressor body 4, and includes two pipelines, a rough adjustment pipeline and a fine adjustment pipeline, and is respectively provided with an exhaust vent rough adjustment valve 10 and an exhaust vent fine adjustment valve 11. The exhaust vent rough adjustment valve 10 and the exhaust vent fine adjustment valve 11 are regulating valves. The diameter of the exhaust vent rough adjustment valve 10 is DN400 to DN500, and the diameter of the exhaust vent fine adjustment valve 11 is DN200 to DN250. The exhaust vent pipeline is connected to the chimney or vent pipe of the factory building.

[0077] An exhaust check valve 12 and an exhaust air supply valve 13 are arranged on the exhaust air supply pipeline. The exhaust air supply valve 13 is a regulating valve. The nominal diameters of the two valves are DN600 to DN1000. The exhaust air supply pipeline is connected to the equipment downstream of the process flow.

[0078] (5) Step 5: Complete the installation and commissioning of the compressor body 4. Complete the installation of the peripheral auxiliary system, including the above-mentioned air intake, exhaust, interstage bleed and other air pipelines, and the commissioning of the corresponding actuators.

[0079] (6) Step 6: Jointly adjust the compression system. During the start-up and shutdown process, close the exhaust air supply valve 13. According to a certain control strategy, the interstage bleed valve, the balance chamber bleed regulating valve 9, the exhaust vent coarse adjustment valve 10, the exhaust vent fine adjustment valve 11, and the inlet adjustable guide vane 5 are linked to ensure the safe start-up and shutdown of the unit, prevent the compressor from surging, and improve the operating stability of the compressor.

[0080] Before the unit speeds up to the rated speed, the inlet adjustable guide vane 5 is controlled in linkage to close the interstage bleed valve. Then, at the rated speed, the exhaust vent coarse adjustment valve 10, the exhaust vent fine adjustment valve 11 and the exhaust air supply valve 13 are adjusted in linkage to gradually transfer the exhaust from the exhaust vent pipeline to the exhaust air supply pipeline, providing the required high-pressure gas for the downstream process equipment.

[0081] In the present invention, after the atmosphere is compressed by the compressor body 4, the interstage bleed pipe, the exhaust vent pipe and the exhaust air supply pipe work together with the inlet adjustable guide vane 5, each of which performs its function under different states of the unit to ensure the high efficiency, safety and flexibility of the compression system.

[0082] Through the above steps, a high-pressure ratio and high-efficiency multi-stage axial flow air compression system can be realized, which can safely and efficiently provide high-pressure air for the process flow and meet the demand for high-pressure air in industrial production.

[0083] Example 2

[0084] The difference between Example 2 and Example 1 is that a single regulating valve is used to replace the combined valve of the exhaust vent coarse adjustment valve 10 and the exhaust vent fine adjustment valve 11 described in Example 1, and the adjustment accuracy of the single regulating valve needs to be doubled to achieve the same function.

[0085] The above are only preferred embodiments of the present invention. The protection scope of the present invention shall be based on the scope defined by the claims. Several improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high-performance multi-stage axial flow air compression system, characterized in that: include: A compressor body (4), one end of which is connected to the motor (2) via a gear box (3), and includes a compressor inlet (4-1) and a compressor outlet (4-2); A single row of inlet adjustable guide vanes (5) is arranged inside the compressor body (4); An air intake pipeline (1) connected to an air intake chamber of a compressor body (4); An interstage air bleed pipeline is connected to the interstage air bleed chamber (14) of the compressor body (4) and has an interstage air bleed valve; The exhaust vent pipeline is connected to the compressor outlet (4-2) of the compressor body (4) and has an exhaust vent valve; the exhaust air supply pipeline is connected to the compressor outlet (4-2) of the compressor body (4) and has an exhaust air supply valve.

2. The high performance multi-stage axial flow air compression system according to claim 1, characterized in that: The interstage bleed pipeline comprises a low-pressure interstage bleed pipeline, a medium-pressure interstage bleed pipeline and a high-pressure interstage bleed pipeline, the low-pressure interstage bleed pipeline is provided with a low-pressure interstage bleed valve (6), the medium-pressure interstage bleed pipeline is provided with a medium-pressure interstage bleed valve (7), and the high-pressure interstage bleed pipeline is provided with a high-pressure interstage bleed valve (8).

3. The high performance multi-stage axial flow air compression system according to claim 1, characterized in that: The chamber where the compressor balance disk (17) of the compressor body (4) is located is also provided with a balance chamber air release pipeline, and the balance chamber air release regulating valve (9) is provided on the balance chamber air release pipeline.

4. The high performance multi-stage axial flow air compression system according to claim 1, characterized in that: The exhaust and venting pipeline comprises an exhaust and venting first pipeline and an exhaust and venting second pipeline. The exhaust and venting first pipeline is provided with an exhaust and venting rough adjustment valve (10), and the exhaust and venting second pipeline is provided with an exhaust and venting fine adjustment valve (11).

5. The high performance multi-stage axial flow air compression system according to claim 1, characterized in that: The exhaust air supply pipeline comprises an exhaust check valve (12) and an exhaust air supply valve (13).

6. The high performance multi-stage axial flow air compression system according to claim 1, characterized in that: The air intake pipeline (1) is provided with a filter and a muffler.

7. A method for using a high-performance multi-stage axial flow air compression system, characterized in that: A high-performance multi-stage axial flow air compression system applicable to any one of claims 1 to 6, including a startup process, a continuous operation process and a shutdown process; The startup process includes: Atmosphere enters the compressor body (4) through the air intake pipeline (1). After being compressed by the compressor body (4), part of the fluid is discharged through the interstage bleed pipeline, and the remaining fluid is discharged through the exhaust bleed pipeline at the compressor outlet (4-2). Before the unit speed increases to the rated speed, the interstage bleed pipeline is closed; After the inter-stage vent pipeline is closed and the unit speed is increased to the rated speed, the exhaust gas is gradually transferred from the exhaust vent pipeline to the exhaust air supply pipeline by adjusting the exhaust vent valve and the exhaust air supply valve in a linked manner to provide the required high-pressure gas for the downstream process equipment.

8. The method for using the high-performance multi-stage axial flow air compression system according to claim 7, characterized in that: The continuous operation process includes: After the exhaust vent pipeline is closed, the unit reaches a continuous operation state, and the atmosphere enters the compressor body (4) through the air intake pipeline (1), and after being compressed by the compressor, it is passed to the downstream process through the exhaust air supply pipeline; before the unit is slowed down and shut down, the exhaust vent valve and the exhaust air supply valve are linked to adjust the exhaust vent valve to gradually transfer the exhaust air from the exhaust air supply pipeline to the exhaust vent pipeline, thereby cutting off the unit from the downstream process flow.

9. The method for using the high-performance multi-stage axial flow air compression system according to claim 8, characterized in that: The shutdown process comprises: opening the inter-stage bleed pipe and starting the speed reduction shutdown; during the shutdown process, the atmosphere enters the compressor body (4) through the air intake pipe (1), and after being compressed by the compressor body (4), part of the fluid is discharged through the inter-stage bleed pipe between the stages of the compressor body (4), and the remaining fluid is discharged through the exhaust bleed pipe at the compressor outlet (4-2).

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